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We have an interior granite wall that has some silicon caulking used in the grout joints. The silicon caused staining along the grout edges. We poulticed the stain and successful removed the staining, However after three months the stain is returning

First, did you remove the silicon caulking. If the source of the staining is not removed it will continue to be a problem. I would recommend removing the silicon caulking and replacing it with a non-staining urethane caulking.

If you did remove the silicon caulking, and the stain is still reappearing chances are you only removed the silicon from the surface of the stone. Any remaining silicon in the stone has migrated toward the surface. You may find you need to poultice the stain several times as it appears to remove all the silicon.

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